At the first, sorry if i put this thread on windows vista forum since i can't find windows 7 forum.
I've already use Windows 7 Beta Build 7000 on my laptops. After installing there is no weird problem. But now i can't close any open window via red X button on top right panel. So i must always use Alt + F4 to close the window.
This problem is happen only for non administrator level (normal user). The latest software installed is AT&T Communication Manager from my Sierra Wireless 881U.
Anyone has same problem with me? How to fix it? Or maybe this is a beta bug on Windows 7?